I've just bought all the kit to laminate our lounge/sitting room. I took a plan of the room in to the shop and the fella calculated everything that was needed.
However, while he worked out how much underlay & beading was required, he hasn't mentioned/supplied any membrane.
If the laminate is being laid onto floorboards, is the membrane really necessary? The boards are suitable for utility rooms & bathrooms so I'm presuming they have a high degree of water resistance anyway.
TIA